John Diamond's 1792 design for the Capitol was topped with a weathercock. Jim Allegro and Doug Michels wanted to build the National Sofa across the street from the White House so that hundreds of people could watch the President on an enormous television. John Russell Pope proposed that the Lincoln Memorial take the form of a step pyramid. Throughout the history of Washington, D.C., architects have proposed both grand and eccentric building ideas. View a slideshow at the link of some of these that were thankfully never built.